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sub box building question

after looking at jmvotto's sub box im wondering if I can use the black board that came in my boat as the front portion of a box--basicaly all I would do is add a box the back half. I would be using plywood coated to protect it, but would haveing 2 different materials matter ?

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Ive done on a number of installs, exactly what you looking to do. I would suggest building the enclosure as a complete box, rather then leaving out the side that would mate with the factory facade. This gives you a lot of surface are to create a sealed, airtight joint between the enclosure and the original facade. I would also use longer screws for the sub so they would bite into the baffle board of the actual enclosure.

Two different materials will not be an issue. Use a contractor grade exterior/waterproof adhesive between the facade and box. If your carpet is blush enough, you can run in some screws around the outer edge, to aid in the bonding. Or, if your careful and lucky, you can separate the carpet form the factory facade with a putty knife. After you have joined the facade and new enclosure with some counter sunk screws, reattach the carpet with some carpet adhesive and staples on the back side.

To take it a step further, you can mount the sub to the new box, then cut a larger hole in the factory facade that fits around the OD of the sub grill. This gives the sub a recessed appearance. This is best done when you can get the carpet off so you can cut the large hole in the facade and have plenty of carpet to wrap around the hole to cover the exposed cut.

Daze, I thought about that too , this way way easier, just built the box seperate and sandwich between with some silicone, etc. its slides into place fairly easy but i doent have that fiberglass floor panel.

If you are recessing the sub then add enough extra diameter to the outside rim to compensate for the carpet wrap thickness.
I agree with the parties above. Don't try to bond dissimilar materials. I am completely comfortable bonding ABS or low density HDPE (but not higher density Starboard HDPE) to themselves. One adhesive will not be effective for both.
But I like the overlay idea on the completed enclosure mentioned above.